Fictional guidebook

Some fictional universes feature useful guidebooks which assist the hero and friends through difficult situations.

Features of a great fictional guidebook: Such books are ideally compact enough to carry on even the most strenuous adventures, yet detailed enough to contain exactly the information the reader needs at that particular point in the plot. Many guidebooks are electronic in nature; some can access relevant information through a wireless connection.

Fictional guidebook	Universe
The Hitch Hikers Guide to the Galaxy	the stories under that name by Douglas Adams
The Junior Woodchucks Guidebook	the Donald Duck stories by Carl Barks
The Book of Rules	the Dancing Gods series by Jack Chalker
A Young Lady's Illustrated Primer	Neal Stephenson's novel, The Diamond Age
Pokedex	Nintendo's Pokemon games and animation
Highly Unpleasant Things It Is Sometimes Necessary to Know and Things That Are Not Good to Know at All	John Barnes's novel, One for the Morning Glory
The Mrin and Darine Codices	David Eddings' Belgariad and Malloreon
Ferengi Rules of Acquisition	Star Trek
'\'Twurp's Peerage''	Terry Pratchett's Discworld series

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see: false document, literature